Patent US4018623A successfully refreshed from Google Patents.
US4018623A
Expired / Lapsed
US
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Method of cutting using a high pressure water jet
Assignee: European Vinyls Corp Technology AG
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Filing: 1975-02-10
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Granted: 1977-04-19
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Expires: 1995-02-10
Abstract
Abstract A method of cutting using a high pressure jet of water in which the jet is maintained in a region of sub-atmospheric pressure, preferably up to 70 cms Hg. Operation at sub-atmospheric pressure significantly enhances the cutting power of a high pressure water jet.
Inventors
- 👤 Michael John Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:40
CPC Classifications
B; B26; B26F; B26F3/00; B26F3/004
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A method of cleaning the interior of a polymerisation reactor having polymeric build-up adhering to the inside wall thereof which method comprises delivering a jet of water with hydraulic pressure of at least 70 atmospheres (68.6 × 10 5 N/m 2 ) inside the reactor onto said build-up while maintaining the entire interior of the reactor at sub-atmospheric pressure whereby the jet exerts a cutting action to remove or loosen said polymeric build-up.
Claim 2
Independent Claim
73 words
A method of cleaning the interior of a polymerisation reactor having polymeric build-up adhering to the inside wall thereof which method comprises delivering a jet of water with hydraulic pressure of at least 70 atmospheres (68.6 × 10 5 N/m 2 ) inside the reactor onto said build-up while maintaining the entire interior of the reactor at sub-atmospheric pressure whereby the jet exerts a cutting action to remove or loosen said polymeric build-up.
Claim 3
Dependent Claim
30 words
A method according to claim 1 wherein the interior of the reactor is maintained at a pressure of up to 70 cm Hg (9.2 × 10 4 N/m 2 ).
Claim 4
Dependent Claim
29 words
A method according to claim 1 wherein the hydraulic pressure of the jet employed is 100-500 atmospheres (9.8 × 10 6 - 49.6 × 10 6 N/m 2 ).
Claim 5
Dependent Claim
24 words
A method according to claim 1 wherein the water jet employed is a dilute aqueous solution of a drag-reducing high molecular weight linear polymer.
Claim 6
Dependent Claim
15 words
A method according to claim 4 wherein the polymer employed is polyacrylamide or polyethylene oxide.
Claim 7
Dependent Claim
23 words
A method according to claim 1 wherein the interior of the reactor is maintained at a pressure not exceeding about 10 cm Hg.
Claim 8
Independent Claim
122 words
A method of cleaning the interior of a polymerization reactor vessel having polymeric build-up adhering to the inside surface of the vessel, said method comprising introducing a jet-forming nozzle into the vessel, delivering water at a pressure of at least 70 atmospheres to the nozzle to thereby form a high-pressure water jet, passing the jet through the atmosphere within the vessel and impinging the jet onto the polymeric build-up to thereby remove or loosen the build-up, evacuating the entire vessel to sub-atmospheric pressure of up to 70 cm Hg while the jet impinges on the polymeric build-up to thereby reduce divergence of the jet and increase its ability to cut the build-up, and removing spent water and removed build-up from the vessel.
Claim 9
Independent Claim
122 words
A method of cleaning the interior of a polymerization reactor vessel having polymeric build-up adhering to the inside surface of the vessel, said method comprising introducing a jet-forming nozzle into the vessel, delivering water at a pressure of at least 70 atmospheres to the nozzle to thereby form a high-pressure water jet, passing the jet through the atmosphere within the vessel and impinging the jet onto the polymeric build-up to thereby remove or loosen the build-up, evacuating the entire vessel to sub-atmospheric pressure of up to 70 cm Hg while the jet impinges on the polymeric build-up to thereby reduce divergence of the jet and increase its ability to cut the build-up, and removing spent water and removed build-up from the vessel.
References Cited (Backward Citations)
US2420396A
Cited
US3022792A
Cited
US3384100A
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US3594849A
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US3479679A
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US3705437A
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US3719191A
Cited
US3753777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |